Iw. Roxburgh et Sv. Vorontsov, ON THE FORMATION OF SPECTRAL-LINE PROFILES OF SOLAR P-MODE, Monthly Notices of the Royal Astronomical Society, 292(1), 1997, pp. 33-36
We address the problem of the opposite asymmetry of low-frequency p-mo
de line profiles observed in intensity and velocity measurements. We u
se a simple model to illustrate that this feature can be explained by
including a contribution from the stochastic excitation velocity field
to the non-resonant background in the Doppler measurements.